US 2026/0253755 A1Published application

Valve set for safety of nuclear power plant, pressure relief valve set, discharge valve set, and isolation valve

AssigneeChina Nuclear Power Engineering Co., Ltd.

InventorsXueyao SHI, Chunning JING, Hui WANG, Qiaoyan CHEN, Changjiang YANG, Guangfei WANG, Yuxiang WU, Yuan CHANG, Henan WANG, Jing SUN, Zhe ZHOU, Ningbo LEI, Xiaohui SUN, Mengli CAI, Shengsheng LIN, Xuhao ZHANG

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Abstract

Disclosed is a valve set for safety of a nuclear power plant, including: first and second valve parts. The first valve part includes a valve body portion and a valve core portion. The valve body portion has a sealed cavity and a valve cavity configured to communicate a primary loop coolant with a medium space. The valve core portion has one end located in the sealed cavity and the other end located in the valve cavity. The second valve part is provided with output and input ends. The output end is communicated with the sealed cavity, while one of the input ends is communicated with the primary loop coolant, and the other is communicated with a pressure source. Also provided are a primary loop hydraulic pressure relief valve set, a valve set for primary loop pressure relief and discharge, and an isolation valve for a passive water injection pipeline.

Claims32

Dependent claims

A primary loop hydraulic pressure relief valve set of a nuclear power plant, characterized in comprising:

a main valve (1-2) and a three-position four-way control valve (1-1), wherein
the main valve (1-2) comprises:
a main valve body and a valve core, the main valve body has a sealed cavity (1-215) and a valve cavity, wherein the valve cavity is configured to communicate a primary loop coolant with atmosphere, the valve core has one end in the sealed cavity (1-215) and the other end in the valve cavity (1-24), and the valve core is slidable in the main valve body under an action of a pressure of a medium entering the sealed cavity (1-215), so as to open or close the valve cavity;
the three-position four-way control valve (1-1) has a first input port (1-17), a second input port (1-18), a third input port (1-19), and an output port (1-16), wherein the output port (1-16) is communicated with the sealed cavity (1-215), the first input port (1-17) is communicated with an atmospheric pressure source, the second input port (1-18) is communicated with the primary loop coolant, and the third input port (1-19) is communicated with a constant pressure source;
and
the three-position four-way control valve (1-1) has a first state in which the output port (1-16) is communicated with the first input port (1-17) and disconnected from both the second input port (1-18) and the third input port (1-19), a second state in which the output port (1-16) is communicated with the second input port (1-18) and disconnected from both the first input port (1-17) and the third input port (1-19), and a third state in which the output port (1-16) is communicated with the third input port (1-19) and disconnected from both the first input port (1-17) and the second input port (1-18), and the three-position four-way control valve is switchable between the first, second and third states to change the medium entering the sealed cavity (1-215) and a pressure thereof, wherein a pressure setting value P0main at which the medium entering the sealed cavity (1-215) opens the main valve (1-2) satisfies:
P0<P0main<Pacc, where P0 is an atmospheric pressure, and Pacc is a pressure of the constant pressure source.

4 more elements

A valve set for primary loop pressure relief and discharge, characterized in comprising:

a main valve (2-2) and a control valve assembly, wherein the main valve (2-2) comprises:
a main valve body and a main valve core, the main valve body has a main sealed cavity (2-215) and a main valve cavity (2-24), the main valve cavity (2-24) is configured to communicate a primary loop coolant with atmosphere, the main valve core has one end in the main sealed cavity (2-215) and the other end in the main valve cavity (2-24), and the main valve core is slidable in the main valve body under an action of a pressure of a medium entering the main sealed cavity (2-215), so as to open or close the main valve cavity (2-24);
the control valve assembly comprises a pilot valve (2-1), a first control valve (2-3) and a second control valve (2-4);
the pilot valve (2-1) comprises a pilot valve body and a pilot valve core, wherein the pilot valve body is provided with a first sealed cavity (2-17), a first channel, a second channel and a second sealed cavity (2-112) arranged in sequence, the pilot valve core comprises a driving structure and a valve core structure, the driving structure has one end in the first sealed cavity (2-17) and the other end in the second sealed cavity (2-112), the valve core structure is connected to the driving structure and has one end in the first channel and the other end in the second channel, the driving structure is slidable in the pilot valve body under an action of a pressure difference of a medium entering the first sealed cavity (2-17) and a medium entering the second sealed cavity (2-112), so as to drive the valve core structure to open the first channel and close the second channel, or close the first channel and open the second channel, and outlets of the first channel and the second channel are both communicated with the main sealed cavity (2-215);
the first control valve (2-3) has a first input port (2-313), a second input port (2-314), and a first output port (2-315), wherein the first output port (2-315) is communicated with the first sealed cavity (2-17), the first input port (2-313) is communicated with a primary loop volume control tank or pressure relief tank, and the second input port (2-314) is communicated with a constant pressure source;
the second control valve (2-4) has a third input port (2-413), a fourth input port (2-414), and a second output port (2-415), wherein the second output port (2-415) is respectively communicated with an inlet of the first channel and the second sealed cavity (2-112), the third input port (2-413) is communicated with a constant pressure source, and the fourth input port (2-414) is communicated with the primary loop coolant;
when the first control valve (2-3) is powered on, the first output port (2-315) is communicated with the first input port (2-313) and disconnected from the second input port (2-314), and when the first control valve (2-3) is powered off, the first output port (2-315) is communicated with the second input port (2-314) and disconnected from the first input port (2-313);
when the second control valve (2-4) is powered on, the second output port (2-415) is communicated with the third input port (2-413) and disconnected from the fourth input port (2-414), and when the second control valve (2-4) is powered off, the second output port (2-415) is communicated with the fourth input port (2-414) and disconnected from the third input port (2-413);
a pressure setting value P0main at which the medium entering the main sealed cavity (2-215) opens the main valve (2-2) satisfies:
P0<P0main<Pacc, where P0 is an atmospheric pressure, and Pacc is a pressure of the constant pressure source;
and
a pressure setting value P0twin at which the medium entering the second sealed cavity (2-112) opening the pilot valve (2-1) satisfies:
Pacc×A1=P0twin×A2, where Pacc is a pressure of the constant pressure source, A1 is a cross sectional area of a first pilot piston (2-15), A2 is a cross sectional area of a second pilot piston (2-110), and A2<A1.

10 more elements

An isolation valve for a passive water injection pipeline of a nuclear power plant, characterized in comprising:

a main valve (3-2) and a two-position three-way control valve (3-1), wherein
the main valve (3-2) comprises:
a main valve body and a valve core, the main valve body has a sealed cavity (3-215) and a valve cavity, wherein the valve cavity is configured to communicate a passive water injection pipeline and a primary loop coolant system, the valve core has one end in the sealed cavity (3-215) and the other end in the valve cavity (3-24), and the valve core is slidable in the main valve body under an action of a pressure of a medium entering the sealed cavity (3-215), so as to open or close the valve cavity;
the two-position three-way control valve (3-1) has a first input port (3-112), a second input port (3-113), and an output port (3-111), wherein the output port (3-111) is communicated with the sealed cavity (3-215), the first input port (3-112) is communicated with the primary loop coolant, and the second input port is communicated with a constant pressure source;
and
the two-position three-way control valve (3-1) has a first state in which the output port (3-111) is communicated with the first input port (3-112) and disconnected from the second input port (3-113), and a second state in which the output port (3-111) is communicated with the second input port (3-113) and disconnected from the first input port (3-112), and the two-position three-way control valve is switchable between the first and second states to change the medium entering the sealed cavity (3-215) and a pressure thereof, wherein a pressure setting value P0main at which the medium entering the sealed cavity (3-215) opens the main valve (3-2) satisfies:
Pgmax<P0main<Pacc, where Pgmax is the highest pressure of the passive water injection pipeline, and Pacc is a pressure of the constant pressure source.

4 more elements

A valve set for safety of a nuclear power plant, characterized in comprising:

a first valve part and a second valve part, wherein
the first valve part comprises a valve body portion and a valve core portion, the valve body portion has a sealed cavity and a valve cavity, the valve cavity is configured to communicate a primary loop coolant with a medium space, the valve core portion has one end in the sealed cavity and the other end in the valve cavity, and the valve core portion is slidable in the valve body portion under an action of a pressure of a medium entering the sealed cavity, so as to open or close the valve cavity and enable communication or isolation of the primary loop coolant and the medium space;
the second valve part is provided with an output end and input ends, the output end is communicated with the sealed cavity, while two or more input ends are provided;
when two input ends are provided, one input end is communicated with the primary loop coolant, and the other input end is communicated with a pressure source;
and when more than two input ends are provided, the input ends are communicated with the primary loop coolant, the pressure source and an atmospheric pressure source, respectively;
the second valve part controls a communication state between the output end and the input ends, so that the output end is communicated with one of the input ends;
a pressure setting value P0main at which the medium entering the sealed cavity opens the first valve part satisfies:
first pressure value<P0main<second pressure value, where the first pressure value is a pressure value in the medium space, and the second pressure value is a pressure value of the pressure source;
and
when a pressure medium output from the output end is greater than the pressure setting value, a valve cavity of the first valve part is opened, and when the pressure medium output from the output end is less than the pressure setting value, the valve cavity of the first valve part is closed.

7 more elements

Dependencies are inferred from the claim text.